[en] The D-5 terms of Fe2+ and Cr2+ in the tetrahedral potential at cation sites in II-VI compounds split into orbital doublet and triplet states. While in Cr2+ the orbital tripler has lower energy than the doublet the opposite is the case in Fe2+. Both ions have singlet ground states after the spin-orbit interaction is taken into account and, hence, both are Van Vleck paramagnets. The optical absorption spectra of Fe and Cr based materials differ and are explained on the basis of a dynamic Jahn-Teller effect in the former and a static one in the latter. These considerations permit us to explain the optical as well as the magnetic properties observed in these materials.
Disciplines :
Physics
Author, co-author :
Colignon, David ; Université de Liège - ULiège > Physique > Physique Théorique et Physique des Semiconducteurs
Kartheuser, Eduard ; Université de Liège - ULiège > Physique > Physique Théorique et Physique des Semiconducteurs
Rodriguez, Sergio; Purdue University - Purdue > Physics
Villeret, Murielle; City University London > Mathematics
Language :
English
Title :
Optical and magnetic properties of Fe2+ and Cr2+ in II-VI semiconductors: The Jahn-Teller effect
Publication date :
1996
Event name :
Seventh International Conference on II-VI Compounds and Devices
